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LTC1701BES5 Datasheet

  • LTC1701BES5

  • Analog IC

  • 12頁

  • ETC

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LTC1701/LTC1701B
1MHz Step-Down
DC/DC Converters in SOT-23
FEATURES
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
Tiny 5-Lead SOT-23 Package
Uses Tiny Capacitors and Inductor
High Frequency Operation: 1MHz
High Output Current: 500mA
Low R
DS(ON)
Internal Switch: 0.28鈩?/div>
High Efficiency: Up to 94%
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
Low Quiescent Current: 135碌A(chǔ) (LTC1701)
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I
Q
< 1碌A(chǔ)
Peak Inductor Current Independent of Inductor Value
Output Voltages from 5V Down to 1.25V
The LTC
廬
1701/LTC1701B are the industry鈥檚 first SOT-23
step-down, current mode, DC/DC converters. Intended for
low to medium power applications, they operate from 2.5V
to 5.5V input voltage range and switch at 1MHz, allowing
the use of tiny, low cost capacitors and inductors 2mm or
less in height. The output voltage is adjustable from 1.25V
to 5V. A built-in 0.28鈩?switch allows up to 0.5A of output
current at high efficiency. OPTI-LOOP
TM
compensation
allows the transient response to be optimized over a wide
range of loads and output capacitors.
The LTC1701 incorporates automatic power saving Burst
Mode
TM
operation to reduce gate charge losses when the
load current drops below the level required for continuous
operation. The LTC1701B operates continuously to very
low load currents to provide low ripple at the expense of
light load efficiency. With no load, the LTC1701 draws only
135碌A(chǔ). In shutdown, both devices draw less than 1碌A(chǔ),
making them ideal for current sensitive applications.
Their small size and switching frequency enables a
complete DC/DC converter function to consume less than
0.3 square inches of PC board area.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Portable Media Players
PC Cards
Handheld Equipment
TYPICAL APPLICATION
V
IN
2.5V TO
5.5V
R4
1M
L1
4.7碌H
V
IN
SW
D1
LTC1701
R2
121k
V
OUT
(2.5V/
500mA)
100
95
90
85
EFFICIENCY (%)
LTC1701
V
IN
= 3.3V
V
OUT
= 2.5V
+
C1
10碌F
+
I
TH
/RUN
R3
GND
5.1k
C3
330pF
V
FB
R1
121k
C2
47碌F
80
75
70
65
60
LTC1701B
C1: TAIYO YUDEN JMK316BJ106ML
C2: SANYO POSCAP 6TPA47M
D1: MBRM120L
L1: SUMIDA CD43-4R7
1701 F01a
55
50
1
10
100
LOAD CURRENT (mA)
1000
1701 F01b
Figure 1. 2.5V/500mA Step-Down Regulator
U
Efficiency Curve
U
U
1

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